Evaluating Alternative Operations Strategies to Improve Travel Time ...

SHRP 2 L11: Final Appendices
thirds said the electronic departure signs and on-board announcements helped them decide to use the Island Explorer bus. And
almost half of the users of the real-time parking information said it helped them decide to use the Island Explorer bus. Traveler
information technologies have contributed to the overall goal of diverting visitors from personal vehicles to using the transit (20).
Strategy: 2.4. Real-Time Information
Category: 2. Information Collection and Dissemination
TREATMENTS AND IMPACTS:
Pre-trip information by 511, web sites, subscription alerts, 511, real-time navigation systems
• Safety: ITS Deployment Analysis Systems (IDAS) models of Advanced Regional Traffic Interactive Management Information
System (ARTIMIS) in Cincinnati and Northern Kentucky estimated traveler information reduced fatalities 3.2% (1).
• Mobility: Drivers who use route-specific travel time information instead of wide-area traffic advisories can improve on-time
performance by 5% to 13% in the Washington DC metropolitan area (1).
Modeling studies in Detroit, Seattle, and Washington, DC have shown slight improvements in corridor capacity with provision of
traveler information (2).
Modeling performed as part of an evaluation of 9 ITS implementation projects in San Antonio, Texas indicated that drivers of
vehicles with in-vehicle navigation devices could experience an 8.1% reduction in delay (3).
A study conducted in Salt Lake City, Utah show that 511 users can reduce peak period late arrivals by 14% when compared to
nonusers. The combination of 511 and DMS showed that the reductions can be up to 24% (4).
Internet traveler users saved 8.4% of travel time in San Antonio Area (14).
The Vehicle Information and Communication System (VICS) in Japan provides the latest road traffic information to drivers via car
navigation systems since 1996. The Japanese Ministry of Construction estimates that with a national deployment rate of 30%,
VICS would reduce traffic congestion by 6%. (33).
• Efficiency: The simulation study in the Washington, DC area found that 40 percent of travelers who use pre-trip traveler
information would save $60.00 or more per year (1).
• Energy/Environment: A simulation study indicated that integrating traveler information with traffic and incident management
systems in Seattle, Washington could reduce emissions by 1% to 3%, lower fuel consumption by 0.8%, and improve fuel economy
by 1.3% (1).
ADDITIONAL DESCRIPTION AND QUANTITATIVE BENEFITS OF TRAVEL-TIME RELIABILITY STRATEGIES Page F-23